Communication between 2 internal NICs when using ip tables to route internrt

My Setup:

In my home setup, I have 3 NICs one that is connected to the internet (enp1s0),
The other two forward internet access to local devices (enp2s0 & enp3s0).

PC1 is connected to enp2s0 with IP Address (10.10.10.2/24).

PC2 is connected to enp3s0 with IP Address (10.10.20.2/24).

Note that I’m using Ubuntu 22.04.4.

Also, I did the following steps to route internet:

1. Uncommented the following line in /etc/sysctl.conf

   net.ipv4.ip_forward=1

2. Configured IP tables using the following commands:

   sudo iptables -t nat -A POSTROUTING -o enp1s0 -j MASQUERADE

   sudo iptables -A INPUT -i enp2s0 -j ACCEPT

   sudo iptables -A INPUT -i enp3s0 -j ACCEPT

My problem:

When I try to make a LAN session for a game or anything else,
PC1 and PC2 can’t see each other’s session (I think they need to be on the same subnet).

Anything I can do & Thanks?